Racing this past weekend, my son was making a pass in our new dragster. Just prior to the finish line, he heard a noise and suddenly lost oil pressure. He banged the Cockpit Power Off and coasted to a stop. There was oil everywhere primarily contained by the diaper. Back in the pits we started the investigation. Upon dropping the diaper we were pleased to see no windows in the block. All of the oil lines were intact however, down in the diaper was the oil bypass valve shuttle, spring, washer, and retention cap. Apparently, the cap came off and the oil pump spit out the valve shuttle and spring. I have been racing for over fifty years and have never experienced this. This is a new engine and one can only speculate that the cap was just not tight from the engine assembly. We cleaned up the mess, checked for any other broken parts (rockers, valve springs, etc.) and reassembled the bypass valve. Fired up the motor and everything was working. Couple of conclusions, without the diaper the parts would have disappeared somewhere down track and lost forever. The diaper caught most of the oil and elimated a major track cleanup. Without the Cockpit power disconnect we may have lost the engine. Check out Greg's thread on in car power disconnects. In my mind, they are mandatory and this experience proves it. If you are racing without a diaper, reconsider that decision.

One of the best things I added to my car when I built it, is the battery shut off, that is easily used when strapped in. A diaper should be on almost every single car going down the track IMO.

To me if it's a dedicated race car there's no reason not to have one. You can get a custom one made by Russler for $201 shipped.

Otherwise shouldn't the ignition key/switch/etc. turn off the fuel pump and deenergize anything required for the car to run? I always saw the master power switch being used in a wreck.

Exactly. A friend of mine has a 64 Dodge with a stock front end, HEMI with big tube headers, and a drag link running through the pan. He has one of Russlers diapers on the car. ZERO reason a SS/AH car can't have one... Why wouldn't you want to have that $200 insurance, to save the car, or yourself?

Let me just say this. There's a big difference between putting a diaper on a Hemi B body and a Hemi A body. That's one of the many reasons why I got rid of my car. On certain cars its just not feasible.